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String.prototype.valueOf() Method in String Class of Javascript Syntax with Examples
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Usage 
String.prototype.valueOf() Method is used to display value of a String object as a string data type.

Example
var str = new String();
  1. str is String object. <typeof str> returns the object string.
  2. str.valueOf() returns string datatype. <typeof str.valueOf()> returns the string datatype value.
Syntax 
StringObject.valueOf()
 
Example
var x = new String('Hello world');

document.write(x.valueOf());
document.write(typeof x);
document.write(typeof x.valueOf());
Output 
Hello world
object
string
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